My first upholstered chair was a slipcovered thing from a big box store that looked great in the catalog and sagged in the seat within a year. What it taught me is that the frame and the cushion underneath matter a lot more than the fabric on top, because fabric can be beautiful on a chair that's falling apart within twelve months.
Before you buy, measure the actual spot it's going in, not just the general area of the room, and measure the doorways and the stairwell too, because a chair that fits the living room on paper can still get stuck in a hallway turn. Leave at least three feet in front of it for legs and walking room, more if people need to get past it to a window or a doorway. Scale matters as much as footprint, a chair with a high back and wide arms can swallow a small room even if the base measurement looks reasonable, so check the overall height and depth against your ceiling and your other furniture, not just the seat width. In a shop, sit in it the way you actually sit, not perched on the edge the way you do when you're testing something. Push down on the seat cushion and see how it recovers. Press on the arms and the back to feel for the frame underneath, you want solid wood or a sturdy frame, not something that flexes or creaks. If it's delivered flat packed or arrives already assembled, run your hand along every seam and check that the fabric is pulled tight and even, with no puckering at the corners, because that's where cheap upholstery shows itself first. Ask about the fabric too, something with a tight weave holds up to daily use far better than a loose linen that looks lovely and marks if you look at it wrong.
An upholstered chair is the wrong choice if you've got a chewer in the house, a puppy or a toddler with a marker habit, because fabric and cushions take damage that wood and leather shrug off. It's also not the move if you need something that gets rearranged constantly, these chairs are heavier than they look and don't love being dragged around every few weeks. Where they do earn their spot is beside a window for reading, in a bedroom corner for pulling on shoes, or as the second seat in a living room that needs softness next to a firmer sofa. They suit a home that's lived in year round, not a seasonal porch or a sunroom that gets damp.
The one mistake to avoid is buying a chair you haven't actually sat in, because the way it looks across a showroom floor tells you nothing about how your back will feel in it after twenty minutes.